Dust collector



Jan. l5 1924. 1,480,685

- u l.. l.. LADD DUST COLLECTOR Fi led June 19. 1922 3 Sheets-511691', l

Wn @Y Jan. 15 1924.

L. L.. LADp DUST- COLLECTOR med hun@ 1e. 1922 3 shets-sneet 2 Jan. 15 1924. 1,480,685 L. L. LADD DUST COLLECTOR Filed' June 19. 1922 3 Sheets-Sheet 5 Patented Jan. 15, 1924.

UNITI-:n STATES LESTER L. LADD, 0F LOCKPORT, ILLINDIS.

DUST COLLECTOR.

Anplieaton tiled .Tune 19, 1922. Serial No. 569,195.

l'o all 'whom it may concern.'

Be it known that I, Lns'rsn L. LADD, a citizeny of the United States, residin at Lockport` in the countyof lVill and tate of Illinois, have invented a certain new and useful Improvement in Dust Collectors, of which vthe following is a full, clear, concise, and exact description, reference being had to `the accompan ing drawings, forming a part of this yspeci ication` `Myinvention relates to dust collectors, auth more particularly to a dust collector which is of such a compact construction that the same can bc applied to individual milling machines. My dust collecting mechanlsm'operates on the principle that dust will collect on the inner face of a revolving member if the dusbladen air is passed by said face.

`It is a purpose of the invention to provide 'a` plurality of members which have inclined `orconical inner faces, and which have slits rovided between adjacent ones of said memers for the iurpose of collecting dust, said .members Aall revolving about a common center. Said members are preferably mounted to revolve With a casing. Mounted to rotate with said dust collecting niembers is a plurality of Scrapers which are adapted to engage withthe inner surfaceof a stationary casing surrounding said rotating parts `sopas `to scrape the dust that would collect on the inner face of said casing oil the same.

Mounted within said rotating dust collecting members is an agitating device comp prising a plurality of blades which rotate at a greater rate of speed than said dust collecting members, said agitating members being so Vshaped as to extend "substantially parallel `to the dust collecting surfaces of the revolving dust collecting members and only slightly clearingsaid surfaces so that ifsuehr-nn amount of dust collects on said surfaces as tort-,ach to said blades, the same wiillie scraped therefrom by said a itating members -or blades. The stationary .rum or casing is preferably provided with a nai row slit through .which the dustpassesv into a separate chamber which is so constructed that the air which passes .ont through the Sli'twitli thedu'st is returned tothe'dustlcoll lector-andi theidust passes out'ofY the ma-` chine. By providing a plurality of openings or slits adjacent the inclin'ed annular faces of the revolving rings or dust collecting members, the dust can be very eil'ectively collected. Due to the inclined surfaces on the dust collecting members and the action of the blades within the same, the dust that is collected thereon will gradually travel outwardly on said surfaces until said dust passes through one of the slits between one ofthe revolving rings and an adjacent ring. As the dust laden air travelsthrough the machine, a considerable quantity of the dust will be deposited on the lirst dust collecting ring, thus reducing' the'volume of the dust in the air and a smaller quantity of dust will be collected on each succeeding ring until the air has passed a sufficient number of other rings so that practically no dust w-ill remain therein when the air passes out of the machine.

It is a purpose of the invention to provide a dust collector which will not readily be put out of commission by the dust elogging the spaces between the revolving rings,

and it has been found that by providing a stationary drum around the revolving memhers with only u small opening therein for the dust to pass out, that the spacing between the rings can be made of such a size that the dust therein will not collect therebetween so as toclog said openings and yet only a Small percentage of the air which passes into the dust collector would be returned thereto due to passing through said slit. i

It is another 'purpose of the invention to so shape the chamber und the revolving parts carrying the agitating means that the dust is thrown toward the outer side of the chamber having the revolvin outer wall portion so as to aid in the epositing of the dust on the inclined annular surfaces.

lt also preferred that the Scrapers provided for loosening the dust fromv thestationay drum be so constructed that the same will act as'spucing means for the annular dust collecting rines, the annular dust collectingr rings prefcraily comprising an inclined o1' conical. wall portion and a straight or dish-like wall portion and the scraper blades are preferably mounted be-` tween the disk-like or radial portions ofthe rings in such a manner toproperly space' theV sa1ne.` The' first collector member havin they inclined ory conic'al #-inner face 44is preiY U erably made such larger than the other colmemhcrs, and is preferably made/in .lectin Vthe sape of a bell having a long inner inclined annular face. As a much larger volume of dust will collect on this face than on the relatively narrow faces of the collector rings, the opening between said bell and the first collector rings must be greater than the opening between tliesimilar smaller collector rin s.

It will e seen that by providing a large number of inclined annular surfaces upon which the dust can collect'and from which it moves through openings into the space within the stationary drum, a much more compact device can be obtained than where the inclined surface is continuous. Also many more openings are provided through which the dust may pass. By providing the agitating means within the chamber it is unnecessary to limit the size of the opening at any particular place in order to obtain a desired amount of suction within the chamber, as would `be the case where an exhaust fan is used.

Other objects and advantages of the invention4 will appear as the descripticl of the accompanying drawin s proceeds. However, I desire to have it istinctly understood that I do not intend to limit myself to the exact details shown or described, but that l intend to include as part of my invention all such obvious changes and modifications of parts as would occur to a person skilled in this art and as would fall within the scope of-the claims.

In the drawings:

Fig. 1 is a longitudinal sectional view of my improved dust collecting deviele` Fig. 2 is a view partly in section and artly in elevation taken onthe line 2 2 of Fig. 1 parts of the device being shown as being broken away so as to better reveal the internal construction thereof;

Fig. 3 is a section taken on the line 3-3 of Fig. 2; v`

Fig. 4 is a development in a plane o f a portion of the inner revolving member;

Fig. 5 is a fragmentary transverse sectional view of a modified form of inner drum; and

Fig. 6 is a Section similar to Fig. 4 of the form'shown in Fig. 5.

Referrin in detail to thedrawings, the improved ust collector is shown as being provided with a Vbase 10 having the standards 11 and 12 thereon, said standard 11 being provided with a bearing 13A for the shaft 14 andthe sleeve 15 which surrounds said shaft 14. -The member 12 isalso provided c1with the bearing portion at 16 and with a casing 17 which is bell-shaped and extends. upwardly and downwardly from the' bearing portion 16. Mounted on one end of the shaft 14 i's a. pulley 18'. The other end of the shaft 14 is pr vided with an agitating member 19 which i provided with a central projection 20 having the curved faces 2l so,

but the number used may be varied in accordan'ce with conditions. that the blades 22 rotate with the shaft 14 and the inner drum 23 also rotates with this shaft due to the fact that the side face 24 thereof is riveted to the blades 22. The drum 23 is provided with a cylindrical inner face 25 providing a cylindrical passa eway 26 lean ing from the inlet pipe 27 to t- 1e agitating member 19. The outer cylindrical wall portion 28 of the drum 23 is provided with a plurality of series of blades, said blades being arranged in rows around the face of the drum, and preferably each row comprises sixteen blades, although this number may be varied in accordance with conditions. The blades of the row adjacent the blades 22 are indicated by the numeral 29 and the succeeding rows of blades across the face'of thel drumV from said row bearing the numeral 29 are designated by the numerals 30, 31, 32

and 33 respectively. The drum 23 isL preferably closed by means of the late 34 at the outer end thereof, while th'e ell-shaped member 17 is preferably vprovided with a curved channeled plate 85 which forms a casingl together' with the portion 17. The sleeve 15 is provided with a bell-sha ed end portion 36 which may be made .integral therewith if desired at one end thereof, and with a pulley 37. The member 36 has/the radially extendin inclined wall portion 39 providing a conical face on the inner surface thereof. The member`36 is also provided with a radially extending flange or lip 40, and secured to said fiange 40 are the annular members 41 and 41', which have the radially extending portions 42 and 42 respectively and the conical or inclined portions 43 and 43 respectively. The radial portions 42 and 42 are provided with openings throu h which the rods or bolts 44 extend. ounted between the flange 40 and the member 42 and between the member 42 and each of the members 42 is a series of blades or Scrapers 45, said Scrapers being provided with inclined faces 46 to correspond tothe'outer faces of the ortions 43 of the annular or ringlike 'mem ers, and with straight faces 4.7 whichare slightl spaced from the i'nerfac .of the curve channel member 35. Said members are also each provided with a central enlargement 48 which is provided with a bore therethrough, as indicated in Fig. 3, through which the bolts 44 extend. i t

It will be seen that 'the members45 serve to space the rings' and also serve as sera ers to remove dust adhering-to the inner ace wall portion 38 and theY It will be seen l (it) llO of the curved channel 35 therefrom. Preferably eight of the members 45 are provided in each row, although this number may be varied in accordance with conditions.

It will be noted that a space is provided between the inclined portion 39 of the memy ber 36 and the inclined portion 43 of the member 41', and also that a space is pro- "be clear from Fig. V4.- and thatsai are' provided with flanges (34 by which'fthe vided between the member 41 and the ad- 'acent member 41 and between all the memrs 41, but that the spacing between the members 41 and the member 41', which are similar in construction, is less than the spacing between the member 39 and the portion 43' of the` member 41. The members 45 are slightly out awa-y as indicated at 49 in said openings so as to prevent any clogging of the same. The members 29 are prov vided with inclined outer edges corre- Sponding substantially in shape to the inclined surfaces of the members 41 and 41, a slight clearance being provided between the outer inclined edge of the blades and the inclined surfaces of the members 41 and Ll1. he pipe or conduit 27 leads from any desired machine from which 'the dust is to be collected and fits loosely within the duct 26 so that the same will not interfere with the rotation of the arts carried by the member 19 which inclucljes the drum 23. The shell from which the curved casing 35 is made is slightly oll'set at the free edge thereof so :is to rovide a slit indicated by the numeral 51. 'ghe lower portion of the member 17 is provided with a downwardly extending portion 52 and a similar downwardly extending side portion 53 is secured to the opposite side of the member 35, said portions 52 and together with the vertical wall portion 5-1 and the inclined wall portion 55, forming a dust collecting chamber 56 which receives the dust passing through the slit or opening 51. Said dust collecting chamber 56 is prefA erably provided with a depending partition or baille wall 57 and with a return pipe "58 leading to the conduit 27.

It will be evident that b v providing the baille wall 57 new air that will enter through the opening 51 from the machine will have to pass around mid baille wallY before it en-' ters the return pi e 58 and into adjacency with the dust out et 59 which is provided with the rotating closure member 60 serving as an air lock to prevent discharge of any of the air into the outlet tube G1. The air locking member 60 is provided with a shaft 62 which is provided with a pulley (33 on the end thereof for driving the same.

It will be seen upon reference to Figs. 2 and 4, that the members 29 are preferably arranged in staggered relationshi i, as will members same are riveted tol the outer face of "the drum 28. However,

in order to simplify `of about only 400 the construction, if desired, instead of making the members 29 separate, a transversely extending blade 65 may be provided which has' the saw tooth portions 29' corresponding to the blades 29 in Fig, 4, but of course, in this form the scraping members 29 will be in transverse alignment instead of staggered.

The members G5 are provided with flanges G6 for securing the same to the drum 28 in a similar manner to which the members 29 are secured to the drum 28. The members 22 are provided with flanges 6T which are adapted to be riveted to the curved outer face 21 of the member 9 for securing said mentbers 22 in place. The member 53 is pro vided with a ring-like portion 68 which is secured to the channel member 35 around the entire outer edge thereof, said member extending to a point short of the outer face of the drum 28 so as to provide an opening 29 between the inner edge TU thereof and the outer face of the drum 28.

ln operation, the dusl-laden air enters through the duct 2i' into the circular chamber 2G which communicates with the space within the wall portion 1T in which the lun blades are located. As the blades 22 rotate with the shaft l-l., and as this shaft is driven through the pulley 18 at about 1690 revoln tions per minute, a strongr current of air is set up which produces a suction that draws the dust-laden air from the duct 27 into the duct 26 and into the space where the fan blades are located. The member 19 is so shaped that the current of air striking the projection 20 thereon is divided, and is thrown in a radially outward direction against the inclined portion 39 of the member 3G. Due to the action of the blades 22, the air is also driven transversely across the series of blades 29, 30, 31, 32 and 33, and as these are rotating at a. high speed the dustladen air is thrown outwardlvagainst the inclined faces 43 and 43 of l ie members 41 and 4:1, thus the dust in the air tends to lodge on the inner faces of these members in a manner similar to that in whi'ch it lodges on the inner faces of pulleys that revolve at a rapid rate which are located in a room filled with dust. The blades 22 are located near the inner face of the inclined portion 39 and are provided with inclined outer edge portions that correspond to the inclination of the inner face of the member 39. The member 39 and the parts carried thereby revolve at a lower rale of speed than-the members that are connected with the shaft 1-4, as the pulley 37 on the shaft V15 rotates at a speed revolutions per minute Dile to, `the fact` that tliamembeeliaving the inclinedfface M239 isrevolving .agidldue Yto the action'of. the blades 22. the dust that setties on the inner face of the portion 39'is gradually moved outwardly along the in- .lll

clined surface until it passes out through the opening between -the member 39 and the member 41. Due to the fact that the parts connected with the member 36 are rotating at a speed of approximately 400 revolutions per minute, the dust passes outwardly into the space between the revolving parts and the stationary casing surrounding the saine, and the dust therein is thrown against the outer diuni or casing In a similar man ner the blades '29 cooperate with the inclined surface 43 of the member 4l which rotates at the saine speed as the portion 39 to force the dust that collects on the inner face of the portion 43 outwardly along said surface and through the o )ening between the member 4l' and the member 41 adjacent thereto. ln a similar manner the blades and the inember 43 o posite this Series of blades cooperate to collect and discharge the dust from the air that strikes the inclined surface 48, the air having dust therein passing successively into adjacency with the blades 3l, 322 and 33 and operating in a similar manner to the blades 30 and 29. As a result. the amount ot dust in the air is graduali reduced until by the time that the air reac ies the opening (il) and is discharged from the'device there is practically no'dust remaining in the same. The

dust that passes out between the adjoining members 43 or between the member 43 and the member 43 adjacent thereto, is also thrown against the inner face ot' the casing by the action of the fan blades 45. .'lhe blades 45 also act as Scrapers to remove the dust that sticks to the inner face of the meinber 35 therefrom. Clearance is provided between thc inner t'ace ol the member 35 and the edges 47 of the members 45 as is evident from the drawings, although this is slightly exaggerated therein. The action olE the Scrapers is such as to gradually force the dust around the inner face ot' the number $35 in a clockwise direction in Fig. 2 until the saine passes out through the slit at 51 into tue space 5H. As there is still a small amount of air mixed, with the dust, a return pipe 5h has to be provided for returning some ol' the. air to the dust collector, due to the t'act that this air will, of course still be laden with dust. The remainder of the dust passes out through the valve at (il). As the opening :it t3!) is much larger than the slit at 5l only about one-tenth ol' the air that pass lin-ouah the machine passes through the slit 5l. thus ninety percent of the air that enters thi` mav chine is completely cleaned of dust.

lt will be seen that due to the fact that all of the air that passes through the slits bctwccn the members 425, tl and the member 39 has to pass through the slit 5l that a somewhat greater spacing can be provided between the members for providing said slits than where the slit acts to limit the air supply passing into the dust collection chamber,

as would be the case if the'easing 35 were not provided as described.

It will also be seen that diie to the stepped arrangement of the plurality of inclined ii1 ner face members for collecting the dust the collecting capacity ol the machine can be greatly varied and can lic made. of much. more compact construction than if only one inclined face member were used, it being evident that the number of collecting rings used can be varied in accordance with the capacity ot' the machine, it being increhy necemary to make the casing 35 wider for the pur )ose of increasing the capacity ot' the machine and adding the desired number of rings to get such a capacity that the .air passing through the opening 69 will have substantially no dust, therein.

Having thus described my invention, what l desire to claim and secure by lil. b'. Lettters latent is:

1. In a dust collector, a stationary casing, means for producing a current ot' air in said casing, a plurality of revolving members having conical inner wall portions within said casing, said hienibers being spaced to provide gaps therebetween and means 'for dislodgiiig dust from the wall of said stationary casing, said casing having a. discharge opening in said wall and said means 'moving over said opening to force the dislodgcdidust therethrough.

2. In a dustcollector, a stationary casing u ymeans tor producing a. current ot air in said casing, a plurality ot' revolvingl members having conical inner wall portions within said casing, said members being spaced to vprovide gaps therebetween and means for dlislodging dust from said stationary casing, said means for producing said current of air rotating at a higher speed than said revolv ing members.

tl. In a dust collector, a plurality of revolving members having inclined inner wall portions, said members being axially spaced i'rom each other? and agitating means mounted for rotation within said members, said agitating means cooperating with said rotating members to push dust collec-ted on said members through the spaces between said members.

4. In a dust collector, a plurality ol' ie- ;volving members having inclined inner wall portions. said members being axially spaced from nach other and agitating iu aus mounted for rotation within` said members, said agitating means cooperating with said rotating members` to fori c dust collected on said members through the spaces between said members. said agitating means rotating at a higher rate ol' speed than said igenibers I. ln a. dust collector, a plurality of revoiving members having inclined. inner wall portions, said members, being axially spaed from each other and a plurality otblades lltl lili) 1,4so,esa

mounted for rotation within said members and independently of Said members and cooperating therewith to force dust collected thereon outwardly through the spaces between said members.

6. In a, dust collector, a plurality of revolving members having inc ined inner wall portions, said members being axially spaced fromeach other, agitating means mounted for rotation within said members, said agitatin means cooperating with said rotatin mem ers to force dust collected on sai members through the spaces between said members and positive means for driving said agit-ating means at a higher speed than said revolving members.

7. In a device of the character described,l a. casing, a plurality of rotating dust collect-` in members mounted within said casing, sind members being axially spaced and baving inclined dust collecting faces, and means within said dust colle: ting members rotatinl at a higher speed than said members, sai means comprising a plurality ot' blades ro! operating with said collecting members to move the dust along said inclined faces and throu l1 the spaces between said members.

8. n e device of the character described, a casing, a liirality 0f rotating dust collecting mem :ers mounted within said casing, said members being axially spaced and having inclined dust collecting faces, means within said dust collecting members rotatingr at a higher speed than said members, said means comprising n. plurality of blades cooperating with said collecting members to move the dust along said inclined faces and Y through the spaces between 'said members,

and means for dislodging dust from the inner faceof said casing.

9. In a device of the character described, an outer chamber having fixed walls, an inner chamber having rotating walls, a duct leading into said inner chamber and agitaty ing means within said inner chamber for drawing dust-laden air into the Same, said inner chamber being provided with means forming an end wall thereof for detlecting the dust-laden air toward the outer side thereof.

10. In a. device of the character described, an outer chamber' having fixed walls, an inner chamber havin rotating walls, certain portions of said wal s being inclined to the axis of rotation, a duct leading into said innerchambcr and agitating means within said inner chamber for drawing dust-laden air into the same, said inner chamber bein provided with means frmin an end wal thereof for delecting the nsteladen air against said inclined portions.

11. In a dust collector, an outer casing, a. member mounted for rotation within said casing, said member being provided with a plurality ot' inclined wall portions, said wall Secure i portions being axially spaced .to provide slits E 12. In a dust collector, an outer casing, a

member 'mounted for rotation within said casin said member being provided with a plura ity of inclined wall portions, said wall portions being axially spaced to provide slits.

therebetween, and an agiteting device mounted for independent `rotation within ,Y

.said member, said agitating device com ris ing a (plurality of fan blades and a rum with a plurality of blades on the outer sur-A face thereof.

thereto, said drum being provided" 13. In a dust collector, an outer casing, a.

member mounted for rotation Within Said casin said member being provided with a plaira ity of inclined wall portions, said wall portions being axially spaced to provide slits therebetween, and iin agiteting device mounted for independent rotation within said member, said agtating device com ris` ing a plurality otl tan blades and a (ruin secure thereto, said drum having a central opening providing an intake duct for said dust collector.

14. ln a dust collector, an outer casing, a, member mounted for rotation within said casing, said mci'nber being provided with a plurality of inclined wall portions, said wall portions being axially spaced to provide slits therebetween, and an agitating device mounted for independent rotation within said member, said a itating device com rising a lurality of gan blades and a rum secure thereto, seid drum having a central opening providin an intake duct for said dust collector, an dust-laden air from said intake duct toward the inner faces of said inclined portions.

15. In a dust collector, an outer casing, s. member mounted for rotation within said ensin r, said member being provided with plura ity ot' inclined wall portions, said wail portions being axially spaced toprovide slits therebetween', and an agitating device mounted for independent rotation with Said. member, said agitating device comprising a plurality of blades conforming to the inner faces of said wall portions, said blades conforming to the inner faces of said inclined wall portions, and being adapted to coo erate therewith to move the dust collecte on saidfaces outwardl toward said slits.

16. In a dust colector, a. casing, a dust collecting bell mount/'ed to rotate in said casing having a conical wall portion, a plurality of dust collectin rings mounted to rotate with said bell, said rings being provided with inclined wall portions forming ste ped continuations of the inner wall of saidlliell,

ineens for de'lecting the l and an agitating device within said bell and rings.

1T. ln a dust collector, a easing, a dust eolleet'ing bell mounted to rotate in said easing having a eonieal wail portion, a plurality of dust collecting rings mounted to rotate with said bell. said rings being provided with wall portions inclined to correspond with the eonieal wall of said bell, said rings being,r axiallv spared from said bell and from each other to provide slits therebetween, and an agitatingl device Within said bell and rings.

IH. ln a dust eolleetor, a easing. a dust` eolleeting bell mounted to rotate. in said easin; r having a eonieal wall portion and l radiali)y extendiimr flange. a plurality ot dust collectingr rings seeured to said flange, means for spaeimgIr said rings to provide slits` thereliiet-ween. and an agitating device within said bell and rings.

19. In a dust eolleetor, a easing, a dust i-oileetinu' bell mounted to rotate in said easing, iiaving a eonieal wall portion and a radially extending: flange. a pluralityr ol' dust collecting` rings si '.red to said flange, means for eine; said rings to prov/ide slit."` therebetween, said rings having inelined wall portions and radiali); extending portions. and an agitating deviee within lsaid bell and rings.

Q0. In a dust eolleetor, a easing, a dust eolleetimer bell mounted to rotate in said easing` having a eonieal wall portion and a radiaily extending flange. a pluralit of dust collet-tiner rings secured to said flange. means 't'or spacing said rings to provide slits therebetween. said rings having inelinel wall portions and radially extending portions, blades for dislodging dust from said easing mounted to rotate with said rings. and au agitation' deviee within said bell and rings.

.i. ln a dust eolleetor, a easing. a dust millet-ting bell mounted to rotate in said easing. having a eonieal wall portion, a plnralit)v oi' dust eolleeting rings mounted to rotate with said bell. .said rings being.,r spat-ed from said bell and from eaeh other to provide slits therebetween, said rings bein; lr provided with inelined wall portions, and an agitating device within said bell and rings, the s )are between said bell and the first of sai rings being greater than the spares between said rings.

22. A device of the character described comprising an outer casino having a. trans verse opening:r therein, a p urality of rotating spaced dusheolleeting members within said easing, a dust chamber below said opening. a fan for throwing the dust'lnden air within said dust collecting: members against4 the inner faces thereof, and means rotatin with said members for moving the dust co leeted in said easingthrough said opening.

23. 1n a dust collector. a plurality of re volving members having inclined inner walt portions, said members being, axially spaced from eaeh other and a ilnralitlvY ot blades` haring inclined outer ends mounted for rotation within .said members and eooperating` therewith to torre dust eolici-ted thereon outwardly through the spares between said members.

24. In a dust collector, a easing, a dust collecting bell mounted to rotate in Said easing having a conical wall portion, a plu ralittv of dust CollectingF rings mounted to rotate with said bell, said rings being provided with inelined'wall portions forming eontinuations of the wall portion of said bell. and anagitating device within said bell and rings.

25. devire of the eharaett-r dtsetibed comprising an outer easingr having a. transverse opening therein. a plurali()Y of rotatingr spaced dust collecting members withii said easing, a dust chamber below said opening. a` tan for throwing the dust laden air within said dust. eolleetini,r members against the inner faces thereof, and means rotating with said members for moving the dust collected iu `said easiimr throughsaid opening, said device havingV a return duet eading from said dust chamber to the intake of said device.

26. ln a dust` eolleetor, a stationary easing having a substantial@1 eylindrieal wall portion. means for producing,r a current of air in said easing, un plurality of revolving members having conical inner wall portions` within said easing, said members beiirf spaced to provide gaps therebetween, and means for dislodging dust. from said wall portion of said stationar casing.

In witness whereof, I iereunto subscribe my name this 16th day of May A. D., 1922.V

LESTER L. LADD. 

